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If been working on this for my daughters 4th grade homework for the last couple hours. I think the question is mistyped. It's impossible for that to work because for a rectangle to have a perimeter of 280ft it's area would be in the 1000's ft squared. Example: perimeter 140ft + 140ft + 20ft + 20 ft=280 ft

Area 140ft * 20ft = 2800ft squared.

I've tried so may other combinations without any success and don't think it's possible.

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Q: If the perimeter is 280 ft what is rectangle with an area between 100 and 150 ft?
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